He said: “You can’t let your game slip or your focus. It’s something I’m working on, but that comes with age and games as well, experience.

“It takes time to learn the game and I’m still learning. There’s plenty more to come.

“I think every game is tough, especially in the Premier League. You saw that against Everton, at Tottenham when we lost, there are no easy games.

“So it’s not just about facing Barcelona to improve your game, but about playing at this level.”

Stones says he isn’t suffering due to his massive price tag.

He added: “I don’t feel more pressure now, not at all. I’ve come here and done what I’ve always done. I feel I’m helping the team out and that’s what I’ve come here to do, to play my football, keep improving, keep doing well.

“It’s a big learning curve and I’m just really enjoying it. I’m an ambitious guy. I would love to keep playing well and, with England, take my form into that as well with the World Cup in mind.

“I want to win trophies, definitely, that’s the aim. This is a big game against Barcelona, a big occasion in the Champions League, and we want to go far in it.“To win it, you need to beat the best teams, we all know that.

“I think we can go to Barcelona and get a big result with how we’ve been playing. Hopefully we can go there and cause a shock.”